Steam turbine facility

Abstract

Provided is a steam turbine facility capable of suppressing the possibility of vibration occurrence and a drastic increase in facility cost, thereby realizing an increase in size of the facility, even if steam conditions of 650° C. or higher are adopted. In a steam turbine facility including a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine, the high-pressure turbine is separated into a first high-pressure turbine part on a high-temperature and high-pressure side and a second high-pressure turbine part on a low-temperature and low-pressure side, the intermediate-pressure turbine is separated into a first intermediate-pressure turbine part on the high-temperature and high-pressure side and a second intermediate-pressure turbine part on the low-temperature and low-temperature side, the first high-pressure turbine part and the first intermediate-pressure turbine part are integrated to form a first integrated part, the second high-pressure turbine part and the second intermediate-pressure turbine part are integrated to form a second integrated part, at least any one of the rotors and casings of the turbines into which steam with a temperature of 650° C. or higher is introduced are constructed by joining together a plurality of members formed from Ni-based alloy through welding as a whole.

1 . A steam turbine facility comprising a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine,
 wherein the high-pressure turbine is separated into a first high-pressure turbine part on a high-temperature and high-pressure side and a second high-pressure turbine part on a low-temperature and low-pressure side,   the intermediate-pressure turbine is separated into a first intermediate-pressure turbine part on a high-temperature and high-pressure side and a second intermediate-pressure turbine part on a low-temperature and low-temperature side,   the first high-pressure turbine part and the first intermediate-pressure turbine part are integrated to form a first integrated part,   at least the second high-pressure turbine part and the second intermediate-pressure turbine part are integrated to form a second integrated part,   at least any one of the rotors and casings of steam-introduction-side turbines of the first high-pressure turbine part and the first intermediate-pressure turbine part, into which steam with a temperature of 650° C. or higher is introduced, are formed from Ni-based alloy, and   at least any one of the overall rotors and the overall casings of the turbines are constructed by joining together a plurality of materials of rotor members or casing members by welding.   
     
     
         2 . The steam turbine facility according to  claim 1 , wherein the first integrated part, the second integrated part, and the low-pressure turbine are connected together on the same axis. 
     
     
         3 . The steam turbine facility according to  claim 1 , further comprising an very-high-pressure turbine into which steam having a higher pressure than the steam introduced into the high-pressure turbine is introduced,
 wherein the very-high-pressure turbine, the first integrated part, the second integrated part, and the low-pressure turbine are connected together on the same axis.   
     
     
         4 . The steam turbine facility according to  claim 1 , wherein steam with a temperature of 650° C. or higher is introduced into the first high-pressure turbine part and the first intermediate-pressure turbine part forming the first integrated part,
 steam with a temperature of less than 650° is introduced into the second high-pressure turbine part and the second intermediate-pressure turbine part forming the second integrated part, 
 the second integrated part and the low-pressure turbine are connected on a different axis from the first integrated part, and 
 the first integrated part is arranged at a position closer to a boiler than the connection structure of the second integrated part and the low-pressure turbine, the boiler superheating the steam introduced into the high-pressure turbine and the intermediate-pressure turbine. 
 
     
     
         5 . The steam turbine facility according to  claim 4 , further comprising an very-high-pressure turbine into which steam having a higher pressure than the steam introduced into the high-pressure turbine is introduced,
 wherein the first integrated part and the very-high-pressure turbine are connected together on the same axis.   
     
     
         6 . The steam turbine facility according to  claim 1 , wherein the second integrated part is further integrated with the low-pressure turbine. 
     
     
         7 . A steam turbine facility comprising a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine,
 wherein the high-pressure turbine is separated into a first high-pressure turbine part on a high-temperature and high-pressure side and a second high-pressure turbine part on a low-temperature and low-pressure side,   the intermediate-pressure turbine is separated into a first intermediate-pressure turbine part on the high-temperature and high-pressure side and a second intermediate-pressure turbine part on the low-temperature and low-temperature side,   the first high-pressure turbine part and the first intermediate-pressure turbine part are integrated to form a first integrated part,   at least any one of the rotors and casings of steam-introduction-side turbines of the first high-pressure turbine part and the first intermediate-pressure turbine part, into which steam with a temperature of 650° C. or higher is introduced, are formed from Ni-based alloy, and   at least any one of the overall rotors and the overall casings of the turbines are constructed by joining together a plurality of materials of rotor members or casing members by welding.   
     
     
         8 . The steam turbine facility according to  claim 7 , wherein the first integrated part, the second high-pressure turbine, the second intermediate-pressure turbine, and the low-pressure turbine are connected together on the same axis. 
     
     
         9 . The steam turbine facility according to  claim 7 , wherein the second high-pressure turbine, the second intermediate-pressure turbine, and the low-pressure turbine are connected to form a connection structure,
 the connection structure is connected on a different axis from the first integrated part, and   the first integrated part is arranged at a position closer to a boiler than the connection structure, the boiler superheating the steam introduced into the high-pressure turbine and the intermediate-pressure turbine.   
     
     
         10 . The steam turbine facility according to  claim 7 , further comprising an very-high-pressure turbine into which steam having a higher pressure than the steam introduced into the high-pressure turbine is introduced,
 wherein the very-high-pressure turbine, the first integrated part, the second intermediate-pressure turbine, and the low-pressure turbine are connected together on the same axis.   
     
     
         11 . The steam turbine facility according to  claim 9 , further comprising an very-high-pressure turbine into which steam having a higher pressure than the steam introduced into the high-pressure turbine is introduced,
 wherein the first integrated part and the very-high-pressure turbine are connected together on the same axis.   
     
     
         12 . The steam turbine facility according to  claim 7 , wherein the second intermediate-pressure turbine part and the low-pressure turbine are integrated. 
     
     
         13 . A steam turbine facility comprising a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine,
 wherein the turbines into which steam with a temperature of 650° C. or higher is introduced are connected together on the same axis,   the turbines into which steam with a temperature of less than 650° C. are connected together on the same axis different from that of the turbines into which the steam with a temperature of 650° C. or higher is introduced,   the turbines into which the steam with a temperature of 650° C. or higher is introduced are arranged at positions closer to the boiler than the turbines into which the steam with a temperature of less than 650° C. is introduced, the boiler superheating the steam introduced into the high-pressure turbine and the intermediate-pressure turbine,   at least any one of the rotors and casings of the turbines into which the steam with a temperature of 650° C. or higher is introduced are formed from Ni-based alloy, and   at least any one of the overall rotors and the overall casings of the turbines are constructed by joining together a plurality of rotor members or casing members by welding.   
     
     
         14 . A steam turbine facility comprising a high-pressure turbine, an intermediate-pressure turbine, and a low-pressure turbine,
 wherein at least the high-pressure turbine and the intermediate-pressure turbine are integrated to form an integrated structure,   the integrated structure and the low-pressure turbine are connected together on the same axis,   at least any one of the rotors and casings of the turbines into which steam with a temperature of 650° C. or higher is introduced are formed from Ni-based alloy, and   at least any one of the overall rotors and the overall casings of the turbines are constructed by joining together a plurality of rotor members or casing members by welding.   
     
     
         15 . The steam turbine facility according to  claim 14 , further comprising an very-high-pressure turbine into which steam having a higher pressure than the steam introduced into the high-pressure turbine is introduced,
 wherein an integrated structure formed by integrating the very-high-pressure turbine with the high-pressure turbine and the intermediate-pressure turbine is connected to the low-pressure turbine on the same axis,   at least any one of the rotors and casings of the very-high-pressure turbine and the high-pressure turbine are formed from Ni-based alloy, and   at least any one of the overall rotors and the overall casings of the turbines are constructed by joining together a plurality of rotor members or casing members by welding.   
     
     
         16 . The steam turbine facility according to  claim 14 , wherein the integrated structure is further integrated with the low-pressure turbine. 
     
     
         17 . The steam turbine facility according to  claim 2 , wherein the second integrated part is further integrated with the low-pressure turbine. 
     
     
         18 . The steam turbine facility according to  claim 3 , wherein the second integrated part is further integrated with the low-pressure turbine. 
     
     
         19 . The steam turbine facility according to  claim 4 , wherein the second integrated part is further integrated with the low-pressure turbine. 
     
     
         20 . The steam turbine facility according to  claim 5 , wherein the second integrated part is further integrated with the low-pressure turbine.